Type-writing machine.



.11. G 1'. KURQWSKI. TYPE WRITING MACHINE.

Patented July 15, 1913.

PLIOATION FILED JUNE 22, 1912.

WITNESSES: 65%;M M 12645151 AT;,TOR EY chines, when the ALFRED G. r.KUROWSKI, 0F BROOKLYN, NEW 'TYPEWBITER COMPANY, or nnw YORK, N. Y.,

r TYPE-WRITING MAcHmn.

Specification of Letters Patent.

YORK, Assmnon To unnnnwoon a CORPORATION Oil-DELAWARE.

Application filed June 22, 1912. Serial N 0. 705,166.

To all whom it may concern:

Bait known that I, AL-rnEnGr. F. KU- ROWSKI, a citizen of the UnitedStates, residing in Brooklyn borough, in the county of Kings and Stateof New York, have invented certain new and useful Improvements inType-Writing Machines, of which the following is a specification.

This invention relates to the. ribbon mechanism of typewriting machines.

In the usual forms of 'typewriting maplaten is' shifted to the uppercase, the portion of the ribbon which covers the printing point isshifted so as to preserve its proper position relatively to the platen,the ribbon being paid out from the suppl spool during the shifting. Theresult i that when the carriage-returns to the lower case there is acertain amount of slack in the ribbon which is liable to smudge thepaper, and prove otherwise. objectionable.

The object of this invention is to overcome I this difficulty, andtothis end I connect to the lift rail frame a pawl which engages theribbon-winding ratchet. Then the lift rail frame is shifted for uppercase, the pawl rides freely over the ratchet teeth, and, when w theframe is returned to lower case, the pawl is a View similar to Fig. 1,

engages the ratchet so as to give it a partial turn which is sufiicientto remove the slack created in the ribbon by .the shift for upper case.

In the accompanying drawings, Figure 1 is. an elevation viewillustrating diagram matically an Underwood writing machine with myinvention applied thereto. Fig. 2 illustrating the carriage and ribbonshifted to the upper case, and in position to receive the typeimpression. Fig. 3 is a perspective detail, illustrating the pawl andits connection to the lift rail frame. Fig. 4 is a detail illustratingthe shifting of the ribbon.

The case shift key 1 has an arm 2 engaging the lift rail frame 3, whichcarries the lift rail 4 adapted to shift the platen to the upper case byengaging a roller 5 mounted on. a bracket; 6 fixed to the platen frame7. The ribbonjfi is wound on spools 9, which are rotated 11y the ribbonfeed ratchet 22 and intermedialeggearing to feed the ribbon.

" Thvratchet 22 is given a step-by-step rotation during the letter feedby the pawls- 22' (Fig. 2 usual mechanism. The ri of the carriageactuated by the ban is guided by a ribbon guide or vibrator 10 connectedto'a lever 11 fulcrumed on a bracket 12 fixed to the lift rail. \Vhenthe raseshift. key is depressed to shift the lift 1- case the latteralso lifts th brator to elevate the ribbon.

key"is-depressed, a type bar l3 frame l6; which, through,bracket'li,ates the lever 11 and vibrator 10 to further move the ribbon intoposition to cover the Patented any is, 1913.

ail to the upper. ever. ,d.vi-. lvhenatype with its; heel 14, engagesthe universal b51115 to shift the printing point. As illustrated inFigs. 2

and 4 this total movement of the ribbon is considerable, which ribbonguide when the plat to thelower case. To tak producesa slack atthe;ramereturns tins-slack as pins 20 fixed to acentto the ribbon feedratchet 22. Mounted on the slide 19, is a pawl 23 engaging the ratchet22. This pawl may be formed with afprojection 24; engaging the lowersurface 0 chine frame, which limits the upward movement of the pawl andavoids the possibility of its being thrown out of position should theratchet accidentally be shifted laterally too far. A spring 25 mountedon the slide holds the pawl yieldingly against the teeth of the ratchet.When the carriage is shifted to the upper case, the pawl is movedforward and rides freely over the ratchet teeth, while when the carriageis returned the pawl gives the ratchet a partial rotation which takes upall the'slack that has been formed. Many variations may be resorted towith- 1n tion shown.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination of a shiftable carriage,ribbon mechanism, and means for taking up the slack formed in the ribbonwhen the carriage is shifted to the upper case.

2. In a typewritin machine, a ribbon feed ratchet, case-shi tingmechanism, and means for operating the ratchet from the case-shiftingmechanism.

3. In a typewriting machine. a case shift a flange 24 (Fig. 3) formed onthe ma-' the scope of this invention. I do not deg sire to be limitedtherefore to the construe key, a lift rail frame operated thereby, a noribbon feed ratchet and means for Operating said ratchet from the liftrail frame.

4. In a typewriting machine, case shifting mechanism, ribbon actuatingmechanism, and means for operating said ribbon actuata ing mechanismfrom the case-shifting mechanism. v a

5. In altypewriting machine, a ribbon feed ratchet, a lift rail frame, alink connected thereto, a slide connected to the link,

and a pawl mounted on the slide engaging the ratchet. v

6. In a typewriting machine, a ribbon feed ratchet, a lift rail frame, alink connectedthereto a slide connected to the link, a pawl mounted onthe slide engaging the ratchet, and a projection on the pawl forlimiting the lateral movement thereof.

7. In a typewriting machine, a ribbon feed ratchet, a lift rail frame, alink con nected thereto,a slide connected to the link,

a pawl mounted on the slide engaging the ratchet, and a" springfor'yieldingly holding the pawl in engagement with the ratchet.

8. In & typ writing machine, a ribbon feed ratchet, a. lift rail frame,a. link connected thereto,=a slide connected to the link,

a pawl mounted'on' tlie'slide engaging the ratchet, a projection onthe-'pawl, and a flange on the mach-me frame extendlng over saidprojection.

Copies of this patent may-be obtained for creasing the length of ribbonbetween the spools and vibrator when the platen is shifted to upper caseposition, and means to automatically take upthe slack in the ribbon.

asthe platen is lowered.

11. In a typewriting. machine, the combination with a shiftabletraveling carriage, of

a ribbon vibrator shiftable with the carriage,

a ribbon spool, ainibbon feed ratchet geared to the spool, mechanism torotate said ratchet during the letter feed travel of. the carriage, apawl for said ratchet, and means to operate saidpawl when thecarriageisreturned from shifted position, and thereby take up slack in the ribbon.

ALFRED G. F. .KU'ROWSKI. Witnesses:

J. AL-Bnornr, v g F. E. ALEXANDER.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

